CVE-2026-5260: Gnutls: gnutls: information disclosure via heap overread in rsa key exchange
- Is it exploited?
Not on CISA's list. CISA has not added it to the Known Exploited Vulnerabilities catalog as of . If CISA adds it, this page shows it as known exploited.
- How likely is exploitation in the next 30 days?
- 0.8%
Down from 0.9% on .
EPSS score, percentile 55.5 of all scored records. A probability estimated by FIRST, not a report of exploitation.
- How severe?
- 8.2 High
CVSS v3.1 base score, given by the CNA
- What should I do?
CISA has set no required action, because the vulnerability is not in KEV.
- Which versions are affected?
Unaffected 0:3.8.10-4.el10_2; 0:3.8.9-9.el10_0.19; 0:3.6.16-8.el8_10.6; 0:3.6.16-8.el8_10.6; 0:3.6.14-10.el8_4.1; 0:4.13-3.el8_4.1; and 14 more
Source: CISA KEV 2026.10.29, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.
What to do
Workaround (from the CVE record)
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Advisories and patches
- RHSA-2026:13274
- RHSA-2026:20611
- RHSA-2026:20612
- RHSA-2026:20613
- RHSA-2026:26319
- RHSA-2026:26409
- RHSA-2026:29197
- RHSA-2026:30004
- RHSA-2026:30849
- RHSA-2026:30850
- RHSA-2026:32962
- RHSA-2026:33125
This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Unaffected | 0:3.8.10-4.el10_2 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:3.8.9-9.el10_0.19 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:3.6.16-8.el8_10.6 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:3.6.16-8.el8_10.6 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:3.6.14-10.el8_4.1 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:4.13-3.el8_4.1 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:3.6.14-10.el8_4.1 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:4.13-3.el8_4.1 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:3.6.16-5.el8_6.5 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:4.13-3.el8_6.2 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:3.6.16-5.el8_6.5 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:4.13-3.el8_6.2 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:3.6.16-7.el8_8.4 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:4.13-4.el8_8.1 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:3.6.16-7.el8_8.4 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:4.13-4.el8_8.1 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:3.8.10-4.el9_8 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:3.8.10-4.el9_8 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:3.7.6-21.el9_2.7 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:3.8.3-4.el9_4.6 |
Versions not listed are: affected.
Versions the record lists as unaffected: 0:3.8.10-4.el10_2, 0:3.8.9-9.el10_0.19, 0:3.6.16-8.el8_10.6, 0:3.6.14-10.el8_4.1, 0:4.13-3.el8_4.1, 0:3.6.16-5.el8_6.5, 0:4.13-3.el8_6.2, 0:3.6.16-7.el8_8.4.
Source: CVE List, as of . About the data.
About this vulnerability
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.
Summary: CVE record, as of .
- CISA has not added CVE-2026-5260 to its Known Exploited Vulnerabilities (KEV) catalog, as of 29 Oct 2026.
- The CVE record was published on 26 May 2026.
- The CVE record carries a CVSS v3.1 base score of 8.2 (High), given by its CNA.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 0.8% (percentile 55.5), as of 29 Oct 2026. EPSS is a statistical estimate, not a report of exploitation.
- CISA's SSVC assessment in the CVE record: exploitation none, automatable yes, technical impact partial.
- The credits in the CVE record name AISLE as finder.
Source: CISA KEV 2026.10.29, as of ; CVE List, as of ; FIRST EPSS, as of . About the data.
Description
Gnutls: gnutls: information disclosure via heap overread in rsa key exchange
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.
Source: CVE List, as of . About the data.
Weakness
CWE-126
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.
Timeline
| Date | Event |
|---|---|
| CVE record published | |
| CVE record last updated |
Known exploited Red Hat vulnerabilities
- CVE-2015-3246: Red Hat Libuser Race Condition Vulnerability
- CVE-2015-5287: Red Hat Automatic Bug Reporting Tool Privilege Escalation Vulnerability
- CVE-2018-14667: Red Hat JBoss RichFaces Framework Expression Language Injection Vulnerability
- CVE-2021-3560: Red Hat Polkit Incorrect Authorization Vulnerability
- CVE-2021-4034: Red Hat Polkit Out-of-Bounds Read and Write Vulnerability