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CVE-2026-97054

HTTP/1 server crash due to MaxBytesReader header race in net/http

No scoreFix available

For HTTP/1 servers, when MaxBytesReader's limit is exceeded, "Connection: close" header is automatically set without synchronization, which might race with another header being set explicitly in the server handler. As a result, an HTTP/1 server that utilizes MaxBytesReader or MaxBytesHandler can crash due to runtime panic if its handler reads the request body concurrently with writing the response header.

Exploit likelihood

0.17%Unchanged since Nov 11, 2026
90%50%10%1%

What each source reports

CVE ListNo score

HTTP/1 server crash due to MaxBytesReader header race in net/http

For HTTP/1 servers, when MaxBytesReader's limit is exceeded, "Connection: close" header is automatically set without synchronization, which might race with another header being set explicitly in the server handler. As a result, an HTTP/1 server that utilizes MaxBytesReader or MaxBytesHandler can crash due to runtime panic if its handler reads the request body concurrently with writing the response header.

Record
CVE-2026-97054
Updated
2026-11-11
EUVDEUVD-2026-123113No score

For HTTP/1 servers, when MaxBytesReader's limit is exceeded, "Connection: close" header is automatically set without synchronization, which might race with another header being set explicitly in the server handler. As a result, an HTTP/1 server that utilizes MaxBytesReader or MaxBytesHandler can crash due to runtime panic if its handler reads the request body concurrently with writing the response header.

Record
EUVD-2026-123113
Updated
2026-11-11
GitHub AdvisoriesGHSA-rg98-f588-44xgNo score

For HTTP/1 servers, when MaxBytesReader's limit is exceeded, "Connection: close" header is...

For HTTP/1 servers, when MaxBytesReader's limit is exceeded, "Connection: close" header is automatically set without synchronization, which might race with another header being set explicitly in the server handler. As a result, an HTTP/1 server that utilizes MaxBytesReader or MaxBytesHandler can crash due to runtime panic if its handler reads the request body concurrently with writing the response header.

Record
GHSA-rg98-f588-44xg
Updated
2026-11-11
NVDNo score

For HTTP/1 servers, when MaxBytesReader's limit is exceeded, "Connection: close" header is automatically set without synchronization, which might race with another header being set explicitly in the server handler. As a result, an HTTP/1 server that utilizes MaxBytesReader or MaxBytesHandler can crash due to runtime panic if its handler reads the request body concurrently with writing the response header.

Record
CVE-2026-97054
Updated
2026-11-11
OSVDEBIAN-CVE-2026-97054No score

For HTTP/1 servers, when MaxBytesReader's limit is exceeded, "Connection: close" header is automatically set without synchronization, which might race with another header being set explicitly in the server handler. As a result, an HTTP/1 server that utilizes MaxBytesReader or MaxBytesHandler can crash due to runtime panic if its handler reads the request body concurrently with writing the response header.

Record
DEBIAN-CVE-2026-97054
Updated
2026-11-11
OSVGO-2026-6859No score

HTTP/1 server crash due to MaxBytesReader header race in net/http

For HTTP/1 servers, when MaxBytesReader's limit is exceeded, "Connection: close" header is automatically set without synchronization, which might race with another header being set explicitly in the server handler. As a result, an HTTP/1 server that utilizes MaxBytesReader or MaxBytesHandler can crash due to runtime panic if its handler reads the request body concurrently with writing the response header.

Record
GO-2026-6859
Updated
2026-11-11
OSVopenSUSE-SU-2026:12529-1No score

go1.26-1.26.11-1.1 on GA media

These are all security issues fixed in the go1.26-1.26.11-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:12529-1
Updated
2026-11-12
OSVUBUNTU-CVE-2026-97054No score

For HTTP/1 servers, when MaxBytesReader's limit is exceeded, "Connection: close" header is automatically set without synchronization, which might race with another header being set explicitly in the server handler. As a result, an HTTP/1 server that utilizes MaxBytesReader or MaxBytesHandler can crash due to runtime panic if its handler reads the request body concurrently with writing the response header.

Record
UBUNTU-CVE-2026-97054
Updated
2026-11-13

Affected products

Affected packages

Affected packages
PackageAffectedFixed
golang-1.19
Debian:12
All versions, plus listed versions
1.19.10-11.19.10-21.19.11-11.19.12-11.19.12-2
Show 7 moreShow less
1.19.12-2~bpo11+11.19.12-2~bpo12+11.19.13-11.19.13-1~bpo11+11.19.13-1~bpo12+11.19.8-21.19.9-1
None known
golang-1.24
Debian:13
All versions, plus listed versions
1.24.12-11.24.13-11.24.13-21.24.4-11.24.4-2
Show 5 moreShow less
1.24.4-31.24.4-41.24.7-11.24.8-11.24.9-1
None known
golang-1.26
Debian:14
All versions, plus listed versions
1.26.0-11.26.1-11.26.10-11.26.10-1~bpo13+11.26.11-1
Show 23 moreShow less
1.26.2-11.26.2-21.26.2-31.26.3-11.26.3-1~bpo13+11.26.3-21.26.3-2~bpo13+11.26.4-11.26.4-1~bpo13+11.26.5-11.26.5-1~bpo13+11.26.6-11.26.6-21.26.7-11.26.7-1~bpo13+11.26.8-11.26.8-1~bpo13+11.26.8-21.26.9-11.26.9-1~bpo13+11.26~rc2-11.26~rc3-11.26~rc3-2
None known
golang-1.27
Debian:14
All versions, plus listed versions
1.27.0-11.27.0-1~bpo13+11.27.1-11.27.1-21.27.1-2~bpo13+1
Show 9 moreShow less
1.27.2-11.27.2-1~bpo13+11.27.2-1~bpo13+21.27.3-11.27.3-1~bpo13+11.27.4-11.27~rc1-11.27~rc2-11.27~rc3-1
None known
stdlib
Go
before 1.26.11, 1.27.0-0 up to 1.27.4
1.26.111.27.4
golang-1.10
Ubuntu:14.04:LTS
All versions, plus listed versions
1.10.4-2ubuntu1~14.04.1
None known
golang-1.10
Ubuntu:16.04:LTS
All versions, plus listed versions
1.10.4-2ubuntu1~16.04.11.10.4-2ubuntu1~16.04.2
None known
golang-1.6
Ubuntu:16.04:LTS
All versions, plus listed versions
1.6-0ubuntu11.6-0ubuntu21.6-0ubuntu31.6-0ubuntu41.6-0ubuntu5
Show 5 moreShow less
1.6.1-0ubuntu11.6.2-0ubuntu5~16.041.6.2-0ubuntu5~16.04.21.6.2-0ubuntu5~16.04.31.6.2-0ubuntu5~16.04.4
None known
golang-1.13
Ubuntu:Pro:16.04:LTS
All versions, plus listed versions
1.13.8-1ubuntu1~16.04.21.13.8-1ubuntu1~16.04.31.13.8-1ubuntu1~16.04.3+esm21.13.8-1ubuntu1~16.04.3+esm3
None known
golang-1.18
Ubuntu:Pro:16.04:LTS
All versions, plus listed versions
1.18.1-1ubuntu1~16.04.61.18.1-1ubuntu1~16.04.6+esm1
None known
Show 36 moreShow less
Affected packages
PackageAffectedFixed
golang-1.10
Ubuntu:18.04:LTS
All versions, plus listed versions
1.10~rc1-11.10~rc1-1ubuntu11.10~rc1-2ubuntu11.10~rc2-1ubuntu11.10-1ubuntu11.10.1-1ubuntu21.10.4-2ubuntu1~18.04.11.10.4-2ubuntu1~18.04.2
None known
golang-1.13
Ubuntu:Pro:18.04:LTS
All versions, plus listed versions
1.13.8-1ubuntu1~18.04.21.13.8-1ubuntu1~18.04.31.13.8-1ubuntu1~18.04.41.13.8-1ubuntu1~18.04.4+esm1
None known
golang-1.16
Ubuntu:Pro:18.04:LTS
All versions, plus listed versions
1.16.2-0ubuntu1~18.04.21.16.2-0ubuntu1~18.04.2+esm1
None known
golang-1.18
Ubuntu:Pro:18.04:LTS
All versions, plus listed versions
1.18.1-1ubuntu1~18.04.31.18.1-1ubuntu1~18.04.41.18.1-1ubuntu1~18.04.4+esm1
None known
golang-1.8
Ubuntu:18.04:LTS
All versions, plus listed versions
1.8.3-2ubuntu11.8.3-2ubuntu1.18.04.1
None known
golang-1.9
Ubuntu:18.04:LTS
All versions, plus listed versions
1.9.1-2ubuntu11.9.2-1ubuntu11.9.2-3ubuntu11.9.3-1ubuntu11.9.4-1ubuntu1
None known
golang-1.13
Ubuntu:20.04:LTS
All versions, plus listed versions
1.13.1-1ubuntu11.13.3-1ubuntu11.13.4-1ubuntu11.13.5-1ubuntu11.13.6-1ubuntu1
Show 5 moreShow less
1.13.6-2ubuntu11.13.7-1ubuntu11.13.8-1ubuntu11.13.8-1ubuntu1.11.13.8-1ubuntu1.2
None known
golang-1.14
Ubuntu:20.04:LTS
All versions, plus listed versions
1.14~beta1-11.14~beta1-21.14~rc1-11.14-11.14.1-1
Show 4 moreShow less
1.14.2-11.14.2-1ubuntu11.14.3-2ubuntu2~20.04.11.14.3-2ubuntu2~20.04.2
None known
golang-1.16
Ubuntu:Pro:20.04:LTS
All versions, plus listed versions
1.16.2-0ubuntu1~20.041.16.2-0ubuntu1~20.04.11.16.2-0ubuntu1~20.04.1+esm1
None known
golang-1.18
Ubuntu:20.04:LTS
All versions, plus listed versions
1.18.1-1ubuntu1~20.04.11.18.1-1ubuntu1~20.04.21.18.1-1ubuntu1~20.04.3
None known
golang-1.20
Ubuntu:20.04:LTS
All versions, plus listed versions
1.20.3-1ubuntu0.1~20.041.20.3-1ubuntu0.1~20.04.1
None known
golang-1.21
Ubuntu:20.04:LTS
All versions, plus listed versions
1.21.1-1~ubuntu20.04.11.21.1-1~ubuntu20.04.21.21.1-1~ubuntu20.04.3
None known
golang-1.22
Ubuntu:20.04:LTS
All versions, plus listed versions
1.22.2-2~20.04.11.22.2-2~20.04.21.22.2-2~20.04.3
None known
golang-1.17
Ubuntu:22.04:LTS
All versions, plus listed versions
1.17-1ubuntu21.17.3-1ubuntu11.17.3-1ubuntu21.17.13-3ubuntu11.17.13-3ubuntu1.21.17.13-3ubuntu1.3
None known
golang-1.18
Ubuntu:22.04:LTS
All versions, plus listed versions
1.18~beta1-0ubuntu11.18~beta2-1ubuntu11.18~beta2-1ubuntu21.18~rc1-1ubuntu11.18-1ubuntu1
Show 4 moreShow less
1.18.1-1ubuntu11.18.1-1ubuntu1.11.18.1-1ubuntu1.21.18.1-1ubuntu1.3
None known
golang-1.20
Ubuntu:22.04:LTS
All versions, plus listed versions
1.20.3-1ubuntu0.1~22.041.20.3-1ubuntu0.1~22.04.1
None known
golang-1.21
Ubuntu:22.04:LTS
All versions, plus listed versions
1.21.1-1~ubuntu22.04.11.21.1-1~ubuntu22.04.21.21.1-1~ubuntu22.04.31.21.1-1~ubuntu22.04.4
None known
golang-1.22
Ubuntu:22.04:LTS
All versions, plus listed versions
1.22.2-2~22.041.22.2-2~22.04.11.22.2-2~22.04.21.22.2-2~22.04.31.22.2-2~22.04.4
None known
golang-1.23
Ubuntu:22.04:LTS
All versions, plus listed versions
1.23.1-1~22.041.23.1-1~22.04.21.23.1-1~22.04.3
None known
golang-1.24
Ubuntu:22.04:LTS
All versions, plus listed versions
1.24.4-1ubuntu1~22.04.11.24.4-1ubuntu1~22.04.21.24.13-2~22.04.11.24.13-2~22.04.2
None known
golang-1.25
Ubuntu:22.04:LTS
All versions, plus listed versions
1.25.14-1~ubuntu0.22.04.1
None known
golang-1.26
Ubuntu:22.04:LTS
All versions, plus listed versions
1.26.8-1~ubuntu0.22.04.2
None known
golang-1.13
Ubuntu:Pro:22.04:LTS
All versions, plus listed versions
1.13.8-1ubuntu21.13.8-1ubuntu2.22.04.11.13.8-1ubuntu2.22.04.1+esm11.13.8-1ubuntu2.22.04.2
None known
golang-1.21
Ubuntu:24.04:LTS
All versions, plus listed versions
1.21.1-11.21.3-11.21.4-11.21.5-11.21.6-1
Show 6 moreShow less
1.21.7-11.21.7-21.21.8-11.21.8-1build11.21.9-11.21.9-1ubuntu0.1
None known
golang-1.22
Ubuntu:24.04:LTS
All versions, plus listed versions
1.22~rc1-21.22.0-11.22.0-21.22.1-11.22.1-1build1
Show 6 moreShow less
1.22.2-21.22.2-2ubuntu0.11.22.2-2ubuntu0.21.22.2-2ubuntu0.31.22.2-2ubuntu0.41.22.2-2ubuntu0.5
None known
golang-1.23
Ubuntu:24.04:LTS
All versions, plus listed versions
1.23.1-1~24.041.23.1-1~24.04.1
None known
golang-1.24
Ubuntu:24.04:LTS
All versions, plus listed versions
1.24.4-1ubuntu1~24.04.11.24.4-1ubuntu1~24.04.21.24.13-2~24.04.1
None known
golang-1.25
Ubuntu:24.04:LTS
All versions, plus listed versions
1.25.14-1~ubuntu0.24.04.1
None known
golang-1.26
Ubuntu:24.04:LTS
All versions, plus listed versions
1.26.8-1~ubuntu0.24.04.2
None known
golang-1.26
Ubuntu:26.10
All versions, plus listed versions
1.26.0-11.26.2-31.26.4-11.26.5-11.26.6-21.26.7-11.26.8-11.26.8-2
None known
golang-1.27
Ubuntu:26.10
All versions, plus listed versions
1.27~rc1-11.27~rc2-11.27~rc3-11.27.0-11.27.1-1
None known
golang-1.23
Ubuntu:26.04:LTS
All versions, plus listed versions
1.23.10-1
None known
golang-1.24
Ubuntu:26.04:LTS
All versions, plus listed versions
1.24.4-1ubuntu11.24.9-11.24.13-2
None known
golang-1.25
Ubuntu:26.04:LTS
All versions, plus listed versions
1.25.0-0ubuntu11.25.7-21.25.14-1~ubuntu0.26.04.1
None known
golang-1.26
Ubuntu:26.04:LTS
All versions, plus listed versions
1.26~rc3-21.26.0-11.26.8-1~ubuntu0.26.04.2
None known
go1.26
openSUSE:Tumbleweed
From an advisory covering 12 CVEs
before 1.26.11-1.1
1.26.11-1.1

History

History
RecordedChangedSources
affected, aliases, referencesOSV
affected, aliases, published, referencesEUVD, OSV
publishedEUVD, NVD, OSV
aliases, referencesGitHub Advisories
affectedOSV
aliasesEUVD
products, referencesCVE List
affected, aliases, description, facts, references, titleOSV
first indexedOSV

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

In short

CVE-2026-97054 is a vulnerability with no CVSS score yet in Go Standard Library Net/http, published November 11, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.17%, the 6th percentile. Fixed in stdlib 1.26.11.

References

Show 19 moreShow less
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