CVE-2026-48959
It was discovered that Perl incorrectly handled certain arguments to Socket and pack/unpack functions. An attacker could possibly use this issue to read sensitive information from memory. (CVE-2026-12087, CVE-2026-57432) It was discovered that Perl incorrectly handled regular expressions with a large number of alternation branches. An attacker could possibly use this issue to cause incorrect matching results. (CVE-2026-13221) It was discovered that Perl incorrectly handled certain files. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-57433, CVE-2025-15649, CVE-2026-48959, CVE-2026-9538) It was discovered that Perl incorrectly handled certain inputs. An attacker could possibly use this issue to execute arbitrary code. (CVE-2026-48962) It was discovered that Perl incorrectly handled credential headers during cross-origin redirects in HTTP::Tiny. An attacker could possibly use this issue to expose sensitive information. (CVE-2026-7017)
CSIRTS triage
- What
- Multiple vulnerabilities including unsafe handling of Socket/pack functions leading to memory disclosure, regex matching errors, denial-of-service issues in file handling, and arbitrary code execution.
- Who is affected
- Systems running Perl with the affected functions in use, impacting a broad set of deployments.
- Urgency
- Multiple severity levels across the CVEs; RCE capability (CVE-2026-48962) requires immediate attention.
- Action
- Apply the Ubuntu security update USN-8684-1 or equivalent patches for your Perl installation.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch CVE-2026-48959
Get an email if CVE-2026-48959 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.
Exploitation outlook
- Low exploitation risk0.37% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 30% of all EPSS-scored CVEs.
Advisory coverage (1)
- unknownUSN-8684-1: Perl vulnerabilitiesubuntu · 2026-08-27
External references
Embed the live status
— this badge updates automatically when the KEV or exploit status changes. How to embed it →
[](https://www.csirts.com/cve/CVE-2026-48959)