CVE-2026-5260: gnutls28 Buffer Over-read
CVSS: 8.2v3.1HighAwaiting analysis
AliasesALPINE-CVE-2026-5260UBUNTU-CVE-2026-5260DEBIAN-CVE-2026-5260
Published 26-05-2026Last modified 15-10-2026
Vulnerability summary
CVE-2026-5260 is a high (CVSS 8.2) Buffer Over-read vulnerability in gnutls28. EPSS estimates a 0.95% chance of exploitation in the next 30 days, higher than 60.4% of scored vulnerabilities.
CVSS score
8.2/10
010
High · v3.1 (CVE.org)EPSS score
0.95%
0%100%
Low · +0.22 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 16 · Related 6Timeline
- 26-05-2026PublishedVulnerability first disclosed.
- 15-10-2026Last modifiedVulnerability information updated.
Description
A flaw was found in libgnutls. A remote attacker, by sending an extremely short premaster secret during an RSA key exchange to a server using an RSA key backed by a PKCS#11 token, could trigger a short heap overread. This memory corruption vulnerability could lead to information disclosure.
CVSS metrics
5 scores · 5 sources · 1 versionHigh 8.2Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:HSourcesAll 5 agree
- OSV · AlpineEcosystem advisory · calculated8.2HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated8.2HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
- OSV · DebianEcosystem advisory · calculated8.2HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
- NVDNIST8.2HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
EPSS trend
Probability
0.95%
Chance of exploitation in the next 30 days
Percentile
60%
Versus all other CVEs
30-day change
+0.22 pp
From 0.73% on 19-09-2026
19-09-202619-10-2026
EPSS score0.95%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Alpine1 product
- gnutls< 3.8.13-r0
Debian1 product
- gnutls28< 3.7.9-2+deb12u7 | < 3.8.9-3+deb13u4 | < 3.8.13-1
Ubuntu1 product
- gnutls28< 3.5.18-1ubuntu1.6+esm3 | < 3.6.13-2ubuntu1.12+esm2 | < 3.7.3-4ubuntu1.9 | All versions (No fix recorded) | < 3.7.3-4ubuntu1.9+Fips1 | < 3.8.3-1.1ubuntu3.6 | < 3.8.3-1.1ubuntu3.6+Fips1.2 | < 3.8.9-3ubuntu2.2 | < 3.8.12-2ubuntu1.1
3 vendors · 3 products
