5.9

CVE-2025-13034: No QUIC certificate pinning with GnuTLS

Modified
AliasesALPINE-CVE-2025-13034UBUNTU-CVE-2025-13034DEBIAN-CVE-2025-13034
Published 08-01-2026Last modified 15-09-2026

Vulnerability summary

CVE-2025-13034 is a medium (CVSS 5.9) Improper Certificate Validation vulnerability in curl. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 15% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.9, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.9/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.24%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 1
MGASA-2026-0003RHSA-2026:6893USN-8062-1

Timeline

  1. 08-01-2026
    PublishedVulnerability first disclosed.
  2. 15-09-2026
    Last modifiedVulnerability information updated.

Description

When using `CURLOPT_PINNEDPUBLICKEY` option with libcurl or `--pinnedpubkey` with the curl tool, curl should check the public key of the server certificate to verify the peer. This check was skipped in a certain condition that would then make curl allow the connection without performing the proper check, thus not noticing a possible impostor. To skip this check, the connection had to be done with QUIC with ngtcp2 built to use GnuTLS and the user had to explicitly disable the standard certificate verification.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

15%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.24% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Alpine1 product
  • curl≥ 8.8.0 (No fix recorded) | ≥ 8.8.0, < 8.14.1-r3 | ≥ 8.8.0, < 8.14.1-r4
Curl1 product
  • curl≥ 8.8.0, < 8.14.2 | ≥ 8.15.0, < 8.16.1 | ≥ 8.17.0, < 8.18.0 | ≥ 3210101088dfa3d6a125d213226b092f2f866722, < 3d91ca8cdb3b434226e743946d428b4dd3acf2c9 | 8.17.0 | 8.16.0 | 8.15.0 | 8.14.1 | 8.14.0 | 8.13.0 | 8.12.1 | 8.12.0 | 8.11.1 | 8.11.0 | 8.10.1 | 8.10.0 | 8.9.1 | 8.9.0 | 8.8.0
Debian1 product
  • curl< 8.14.1-2+deb13u3 | < 8.18.0~rc2-1
Haxx1 product
  • curl≥ 8.8.0, < 8.18.0
Ubuntu1 product
  • curl< 8.14.1-2ubuntu1.1

5 vendors · 5 products

References

7 links