CVE-2025-29785
quic-go Has Panic in Path Probe Loss Recovery Handling
quic-go is an implementation of the QUIC protocol in Go. The loss recovery logic for path probe packets that was added in the v0.50.0 release can be used to trigger a nil-pointer dereference by a malicious QUIC client. In order to do so, the attacker first sends valid QUIC packets from different remote addresses (thereby triggering the newly added path validation logic: the server sends path probe packets), and then sending ACKs for packets received from the server specifically crafted to trigger the nil-pointer dereference. v0.50.1 contains a patch that fixes the vulnerability. This release contains a test that generates random sequences of sent packets (both regular and path probe packets), that was used to verify that the patch actually covers all corner cases. No known workarounds are available.
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
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
quic-go Has Panic in Path Probe Loss Recovery Handling
quic-go is an implementation of the QUIC protocol in Go. The loss recovery logic for path probe packets that was added in the v0.50.0 release can be used to trigger a nil-pointer dereference by a malicious QUIC client. In order to do so, the attacker first sends valid QUIC packets from different remote addresses (thereby triggering the newly added path validation logic: the server sends path probe packets), and then sending ACKs for packets received from the server specifically crafted to trigger the nil-pointer dereference. v0.50.1 contains a patch that fixes the vulnerability. This release contains a test that generates random sequences of sent packets (both regular and path probe packets), that was used to verify that the patch actually covers all corner cases. No known workarounds are available.
- Record
CVE-2025-29785- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-248
- Updated
- 2026-11-02
EUVDEUVD-2025-16643
quic-go is an implementation of the QUIC protocol in Go. The loss recovery logic for path probe packets that was added in the v0.50.0 release can be used to trigger a nil-pointer dereference by a malicious QUIC client. In order to do so, the attacker first sends valid QUIC packets from different remote addresses (thereby triggering the newly added path validation logic: the server sends path probe packets), and then sending ACKs for packets received from the server specifically crafted to trigger the nil-pointer dereference. v0.50.1 contains a patch that fixes the vulnerability. This release contains a test that generates random sequences of sent packets (both regular and path probe packets), that was used to verify that the patch actually covers all corner cases. No known workarounds are available.
- Record
EUVD-2025-16643- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-j972-j939-p2v3
quic-go Has Panic in Path Probe Loss Recovery Handling
Impact
The loss recovery logic for path probe packets that was added in the v0.50.0 release can be used to trigger a nil-pointer dereference by a malicious QUIC client.
In order to do so, the attacker first sends valid QUIC packets from different remote addresses (thereby triggering the newly added path validation logic: the server sends path probe packets), and then sending ACKs for packets received from the server specifically crafted to trigger the nil-pointer dereference.
Patches
v0.50.1 contains a patch that fixes the vulnerability.
This release contains a test that generates random sequences of sent packets (both regular and path probe packets), that was used to verify that the patch actually covers all corner cases.
Workarounds
No.
References
This issue has been reported publicly, but without any context, in https://github.com/quic-go/quic-go/issues/4981.
- Record
GHSA-j972-j939-p2v3- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-248
- Updated
- 2026-11-02
NVD
quic-go is an implementation of the QUIC protocol in Go. The loss recovery logic for path probe packets that was added in the v0.50.0 release can be used to trigger a nil-pointer dereference by a malicious QUIC client. In order to do so, the attacker first sends valid QUIC packets from different remote addresses (thereby triggering the newly added path validation logic: the server sends path probe packets), and then sending ACKs for packets received from the server specifically crafted to trigger the nil-pointer dereference. v0.50.1 contains a patch that fixes the vulnerability. This release contains a test that generates random sequences of sent packets (both regular and path probe packets), that was used to verify that the patch actually covers all corner cases. No known workarounds are available.
- Record
CVE-2025-29785- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-248
- Updated
- 2026-11-02
OSV
quic-go Has Panic in Path Probe Loss Recovery Handling
quic-go is an implementation of the QUIC protocol in Go. The loss recovery logic for path probe packets that was added in the v0.50.0 release can be used to trigger a nil-pointer dereference by a malicious QUIC client. In order to do so, the attacker first sends valid QUIC packets from different remote addresses (thereby triggering the newly added path validation logic: the server sends path probe packets), and then sending ACKs for packets received from the server specifically crafted to trigger the nil-pointer dereference. v0.50.1 contains a patch that fixes the vulnerability. This release contains a test that generates random sequences of sent packets (both regular and path probe packets), that was used to verify that the patch actually covers all corner cases. No known workarounds are available.
- Record
CVE-2025-29785- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-248
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2025-29785
quic-go is an implementation of the QUIC protocol in Go. The loss recovery logic for path probe packets that was added in the v0.50.0 release can be used to trigger a nil-pointer dereference by a malicious QUIC client. In order to do so, the attacker first sends valid QUIC packets from different remote addresses (thereby triggering the newly added path validation logic: the server sends path probe packets), and then sending ACKs for packets received from the server specifically crafted to trigger the nil-pointer dereference. v0.50.1 contains a patch that fixes the vulnerability. This release contains a test that generates random sequences of sent packets (both regular and path probe packets), that was used to verify that the patch actually covers all corner cases. No known workarounds are available.
- Record
DEBIAN-CVE-2025-29785- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
Show 4 moreShow less
OSVGHSA-j972-j939-p2v3
quic-go Has Panic in Path Probe Loss Recovery Handling
Impact
The loss recovery logic for path probe packets that was added in the v0.50.0 release can be used to trigger a nil-pointer dereference by a malicious QUIC client.
In order to do so, the attacker first sends valid QUIC packets from different remote addresses (thereby triggering the newly added path validation logic: the server sends path probe packets), and then sending ACKs for packets received from the server specifically crafted to trigger the nil-pointer dereference.
Patches
v0.50.1 contains a patch that fixes the vulnerability.
This release contains a test that generates random sequences of sent packets (both regular and path probe packets), that was used to verify that the patch actually covers all corner cases.
Workarounds
No.
References
This issue has been reported publicly, but without any context, in https://github.com/quic-go/quic-go/issues/4981.
- Record
GHSA-j972-j939-p2v3- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-248
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2025-29785
quic-go is an implementation of the QUIC protocol in Go. The loss recovery logic for path probe packets that was added in the v0.50.0 release can be used to trigger a nil-pointer dereference by a malicious QUIC client. In order to do so, the attacker first sends valid QUIC packets from different remote addresses (thereby triggering the newly added path validation logic: the server sends path probe packets), and then sending ACKs for packets received from the server specifically crafted to trigger the nil-pointer dereference. v0.50.1 contains a patch that fixes the vulnerability. This release contains a test that generates random sequences of sent packets (both regular and path probe packets), that was used to verify that the patch actually covers all corner cases. No known workarounds are available.
- Record
UBUNTU-CVE-2025-29785- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVGO-2025-3735 No score
Panic in Path Probe Loss Recovery Handling in github.com/quic-go/quic-go
Panic in Path Probe Loss Recovery Handling in github.com/quic-go/quic-go
- Record
GO-2025-3735- Updated
- 2026-11-02
OSVopenSUSE-SU-2025:15225-1 No score
govulncheck-vulndb-0.0.20250612T141001-1.1 on GA media
These are all security issues fixed in the govulncheck-vulndb-0.0.20250612T141001-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2025:15225-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
github.com/quic-go/quic-goGo |
0.50.0 up to 0.50.1 | 0.50.1 |
golang-github-lucas-clemente-quic-goDebian:12 |
All versions, plus listed versions 0.29.0-10.29.2-10.29.2-20.29.2-30.37.0-1 Show 18 moreShow less0.37.4-10.37.4-1~bpo12+10.38.2-10.38.2-20.46.0-10.46.0-20.46.0-2~bpo12+10.50.0-10.50.1-10.50.1-20.54.0-10.54.0-20.54.0-30.54.1-10.55.0-10.59.0-10.59.0-20.59.0-2~bpo13+1 |
None known |
golang-github-lucas-clemente-quic-goDebian:13 |
before 0.50.1-1 | 0.50.1-1 |
golang-github-lucas-clemente-quic-goDebian:14 |
before 0.50.1-1 | 0.50.1-1 |
golang-github-lucas-clemente-quic-goUbuntu:22.04:LTS |
All versions, plus listed versions 0.18.0-30.24.0-10.25.0-1 |
None known |
golang-github-lucas-clemente-quic-goUbuntu:24.04:LTS |
All versions, plus listed versions 0.37.4-10.38.2-1 |
None known |
govulncheck-vulndbopenSUSE:Tumbleweed From an advisory covering 29 CVEs |
before 0.0.20250612T141001-1.1 | 0.0.20250612T141001-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2025-29785 is a high vulnerability (CVSS 7.5) in Quic-go, published June 2, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.50%, the 43rd percentile. Fixed in github.com/quic-go/quic-go 0.50.1.
References
github.com/quic-go/quic-go/security/advisories/GHSA-j972-j939-p2v3
nvd.nist.gov/vuln/detail/CVE-2025-29785
Show 33 moreShow less
security-tracker.debian.org/tracker/CVE-2025-29785
ubuntu.com/security/CVE-2025-29785
cve.org/CVERecord?id=CVE-2025-29785
suse.com/security/cve/CVE-2020-36846