CVE-2015-8853: fedoraproject fedora Improper Input Validation
Vulnerability summary
CVE-2015-8853 is a high (CVSS 7.5) Improper Input Validation vulnerability in fedoraproject fedora. EPSS estimates a 2.55% chance of exploitation in the next 30 days, higher than 85% of scored vulnerabilities.
Severe, CVSS 7.5 (NVD); no exploitation reported by the 5 checked sources; EPSS 3% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 4 · Related 3Timeline
- 25-05-2016PublishedVulnerability first disclosed.
- 06-08-2024Last modifiedVulnerability information updated.
Description
The (1) S_reghop3, (2) S_reghop4, and (3) S_reghopmaybe3 functions in regexec.c in Perl before 5.24.0 allow context-dependent attackers to cause a denial of service (infinite loop) via crafted utf-8 data, as demonstrated by "a\x80."
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
2.55%
Chance of exploitation in the next 30 days
Percentile
85%
Versus all other CVEs
30-day change
No change 0.00 pp
From 2.55% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Debian1 product
- perl< 5.22.1-1
Fedoraproject1 product
- fedoraEOL22
Mageia1 product
- perl< 5.20.1-8.3.mga5
Perl1 product
- perl≤ 5.23.9
Ubuntu1 product
- perl< 5.18.2-2ubuntu1.4
5 vendors · 5 products
References
21 links- rt.perl.org/Public/Bug/Display.html?id=123562X Refsource CONFIRM
- www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.htmlX Refsource CONFIRM
- www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.htmlX Refsource CONFIRM
- bugzilla.redhat.com/show_bug.cgi?id=1329106X Refsource CONFIRM
Show all 21 references
- perl5.git.perl.org/perl.git/commitdiff/22b433eff9a1ffa2454e18405a56650f07b385b5X Refsource CONFIRMVendor Advisory
- lists.fedoraproject.org/pipermail/package-announce/2016-May/183592.htmlVendor AdvisoryX Refsource FEDORA
