USN-8675-2: Perl vulnerabilities
USN-8675-1 fixed vulnerabilities in Perl. This update provides the corresponding fix for Perl on Ubuntu 26.04 LTS. Original advisory details: It was discovered that Perl incorrectly handled short source addresses in the Socket module. An attacker could possibly use this issue to trigger an out-of-bounds heap read, resulting in information disclosure. (CVE-2026-12087) It was discovered that Perl incorrectly handled regular expressions containing a large number of fixed string alternatives. An attacker could possibly use this issue to cause incorrect regular expression matches, resulting in security restrictions being bypassed. (CVE-2026-13221) It was discovered that Perl incorrectly handled certain large repeat counts when processing pack and unpack templates. An attacker could possibly use this issue to trigger an out-of-bounds heap read, resulting in information disclosure. (CVE-2026-57432) It was discovered that Perl incorrectly handled certain crafted data when deserializing with the Storable module. An attacker could possibly use this issue to trigger an integer overflow and application termination, resulting in a denial of service. (CVE-2026-57433)
Details
Original advisory: https://ubuntu.com/security/notices/USN-8675-2
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-120870.37% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 31% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-132210.43% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 36% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-574320.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 11% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-574330.36% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 29% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-12087 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-13221 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-57432 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-57433 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- medium[UPDATE] [mittel] Perl: Mehrere Schwachstellencert-bund
- high[NEW] [high] IBM AIX and VIOS: Multiple vulnerabilitiescert-bund
- unknownUSN-8684-1: Perl vulnerabilitiesubuntu
- unknownUSN-8675-1: Perl vulnerabilitiesubuntu
- unknownNCSC-2026-0321 [1.00] [M/H] Meerdere kwetsbaarheden verholpen in IBM AIX en IBM PowerVM VIOSncsc-nl
- highCVE-2026-57432: Perl versions through 5.43.10 have an integer overflow in S_measure_struct leading to an out-o…msrc
- criticalCVE-2026-57433: Storable versions before 3.41 for Perl have a signed integer overflow when deserializing a cra…msrc
- mediumCVE-2026-13221: Perl versions through 5.43.9 produce silently incorrect regular expression matches when an alt…msrc
- criticalCVE-2026-57433: Storable versions before 3.41 for Perl have a signed integer overflow when deserializing a cra…nvd
- highCVE-2026-57432: Perl versions through 5.43.10 have an integer overflow in S_measure_struct leading to an out-o…nvd
- criticalCVE-2026-13221: Perl versions through 5.43.9 produce silently incorrect regular expression matches when an alt…nvd
- criticalCVE-2026-12087: Socket versions before 2.041 for Perl have an out-of-bounds heap readmsrc
More from Ubuntu Security Notices
- unknownUSN-8747-1: Beets vulnerability2026-09-10
- unknownUSN-8746-1: libEBML vulnerability2026-09-10
- unknownUSN-8745-1: KissFFT vulnerabilities2026-09-10
- unknownUSN-8748-1: Linux kernel (NVIDIA) vulnerabilities2026-09-10
- unknownUSN-8744-1: Python vulnerabilities2026-09-10