A heap buffer overflow vulnerability was discovered in Perl. Release branches 5.34, 5.36, 5.38 and 5.40 are affected, including development versions from 5.33.1 through 5.41.10. When there are non-ASCII bytes in the left-hand-side of the `tr` operator, `S_do_trans_invmap` can overflow the destination pointer `d`. $ perl -e '$_ = "\x{FF}" x 1000000; tr/\xFF/\x{100}/;' Segmentation fault (core dumped) It is believed that this vulnerability can enable Denial of Service and possibly Code Execution attacks on platforms that lack sufficient defenses.
Conclusion & alert: CVE-2024-56406 is rated Moderate Risk (47/100): CVSS High severity, with low exploitation likelihood (EPSS 0.47%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.06% | 0.47% | +0.41% |
| 2 | 2026-02-04 | 0.02% | 0.06% | +0.04% |
| 3 | 2026-02-01 | — | 0.02% | — |
Full EPSS history (12 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 8.4 | 3.1 | HIGH |
|
2.5 | 5.9 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2024-56406: 1 source package rows (perl); 26 state rows across 6 repos (3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 8, open 18. | https://security.alpinelinux.org/vuln/CVE-2024-56406 |
debian
|
unimportant | CVE-2024-56406 unimportant priority: Debian including 1 source packages (perl), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2024-56406 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2024-56406 |
suse
|
high | CVE-2024-56406 severity important: SUSE including 259 source package names (13.2-9.1:perl-5.38.2-slfo.1.1_2.1, 13.2-9.1:perl-base-5.38.2-slfo.1.1_2.1, …), 449 product×package rows across 86 product lines (Container suse/sl-micro/6.0/baremetal-os-container, Container suse/sl-micro/6.0/base-os-container, … (86 product lines)): Known Affected 231, Known Not Affected 130, Fixed 88. | https://www.suse.com/security/cve/CVE-2024-56406/ |
ubuntu
|
medium | CVE-2024-56406 medium priority: Ubuntu including 1 source packages (perl), 9 status rows across 9 suites (bionic, focal, jammy, noble, oracular, plucky, trusty, upstream, xenial): released 5, not-affected 4. | https://ubuntu.com/security/CVE-2024-56406 |